# print("hello world")
# print("hello world")
# print("hello world")
# print("hello world")
# print("hello world")

n = 0  # 判断条件
while n < 5:
    print("hello world")
    n += 1  # 判断条件更新
# for i in range(0, 5):
#     print("hello world")

# 高斯求和 1+2+3+...+100
n = 1
total = 0
while n <= 100:
    total += n  # total = total + n
    n += 1  # n = n + 1
print(total)
